SCHEDULE 13G/A 0001104659-22-023181 0001665603 XXXXXXXX LIVE 4 Class A Common Stock, $0.00001 par value per share 03/31/2025 0001866692 Amplitude, Inc. 03213A104 201 THIRD STREET, SUITE 200 SAN FRANCISCO CA 94103 Rule 13d-1(d) Battery Ventures XI-A, L.P. b DE 0.00 1587632.00 0.00 1587632.00 1587632.00 1.6 PN Battery Ventures XI-B, L.P. b DE 0.00 419490.00 0.00 419490.00 419490.00 0.4 PN Battery Ventures XI-A Side Fund, L.P. b DE 0.00 1649453.00 0.00 1649453.00 1649453.00 1.7 PN Battery Ventures XI-B Side Fund, L.P. b DE 0.00 357671.00 0.00 357671.00 357671.00 0.4 PN Battery Investment Partners XI, LLC b DE 0.00 73579.00 0.00 73579.00 73579.00 0.1 OO Battery Partners XI, LLC b DE 0.00 2080701.00 0.00 2080701.00 2080701.00 2.1 OO Battery Partners XI Side Fund, LLC b DE 0.00 2007124.00 0.00 2007124.00 2007124.00 2.0 OO Battery Ventures Select Fund I, L.P. b DE 0.00 327766.00 0.00 327766.00 327766.00 0.3 PN Battery Partners Select Fund I, L.P. b DE 0.00 327766.00 0.00 327766.00 327766.00 0.3 PN Battery Investment Partners Select Fund I, L.P. b DE 0.00 35713.00 0.00 35713.00 35713.00 0.0 PN Battery Partners Select Fund I GP, LLC b DE 0.00 363479.00 0.00 363479.00 363479.00 0.4 OO Neeraj Agrawal b X1 214481.00 4451304.00 214481.00 4451304.00 4665785.00 4.7 IN Michael M. Brown b X1 180194.00 4451304.00 180194.00 4451304.00 4631498.00 4.7 IN Morad Elhafed b X1 9469.00 363479.00 9469.00 363479.00 372948.00 0.4 IN Jesse Feldman b X1 69202.00 4451304.00 69202.00 4451304.00 4520506.00 4.6 IN Russell L. Fleischer b X1 83227.00 4451304.00 83227.00 4451304.00 4534531.00 4.6 IN Roger H. Lee b X1 71527.00 4451304.00 71527.00 4451304.00 4522831.00 4.6 IN Chelsea R. Stoner b X1 157202.00 4451304.00 157202.00 4451304.00 4608506.00 4.7 IN Dharmesh Thakker b X1 0.00 4451304.00 0.00 4451304.00 4451304.00 4.5 IN Scott R. Tobin b X1 71526.00 4451304.00 71526.00 4451304.00 4522830.00 4.6 IN Amplitude, Inc. 201 THIRD STREET, SUITE 200, SAN FRANCISCO, CA, 94103. The names of the persons filing this report (collectively, the "Reporting Persons") are: Battery Ventures XI-A, L.P. ("BV11-A") Battery Ventures XI-B, L.P. ("BV11-B") Battery Ventures XI-A Side Fund, L.P. ("BV11-A SF") Battery Ventures XI-B Side Fund, L.P. ("BV11-B SF") Battery Investment Partners XI, LLC ("BIP11") Battery Partners XI, LLC ("BP11") Battery Partners XI Side Fund, LLC ("BP11SF") Battery Ventures Select Fund I, L.P. ("BV Select I") Battery Partners Select Fund I, L.P. ("BP Select I") Battery Investment Partners Select Fund I, L.P. ("BIP Select I") Battery Partners Select Fund I GP, LLC ("BP Select I GP") Neeraj Agrawal ("Agrawal") Michael M. Brown ("Brown") Morad Elhafed ("Elhafed") Jesse Feldman ("Feldman") Russel L. Fleischer ("Fleischer") Roger H. Lee ("Lee") Chelsea R. Stoner ("Stoner") Dharmesh Thakker ("Thakker") Scott R. Tobin ("Tobin") The Reporting Persons expressly disclaim status as a "group" for purposes of this Schedule 13G. Battery Ventures One Marina Park Drive Suite 1100 Boston, MA 02210 BV11-A Delaware BV11-B Delaware BV-11A SF Delaware BV-11B SF Delaware BIP11 Delaware BP11 Delaware BP11SF Delaware BV Select I Delaware BP Select I Delaware BIP Select I Delaware BP Select I GP Delaware Agrawal United States Brown United States Elhafed United States Feldman United States Fleischer United States Lee United States Stoner United States Thakker United States Tobin United States Y Row 9 of each Reporting Person's cover page to this Schedule 13G sets forth the aggregate number of shares of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. The Reporting Persons' beneficial ownership of the Issuer's Class A Common Stock consists of (i) 1,587,632 shares of Class A common stock held directly by BV11-A; (ii) 419,490 shares of Class A common stock held directly by BV11-B; (iii) 1,649,453 shares of Class A common stock held directly by BV11-A SF; (iv) 357,671 shares of Class A common stock held directly by BV11-B SF; (v) 73,579 shares of Class A common stock held directly by BIP11; (vi) 327,766 shares of Class A common stock held directly by BV Select I; (vii) 35,713 shares of Class A common stock held directly by BIP Select I; (viii) 214,481 shares of Class A common stock held by Agrawal; (ix) 180,194 shares of Class A common stock held by Brown; (x) 9,469 shares of Class A common stock held by Elhafed; (xi) 69,202 shares of Class A common stock held by Feldman; (xii) 83,227 shares of Class A common stock held by Fleischer; (xiii) 71,527 shares of Class A common stock held by Lee; (xiv) 157,202 shares of Class A common stock held by Stoner; and (xv) 71,526 shares of Class A common stock held by Tobin. BP11 is the general partner of each of BV11-A and BV11-B and the managing member of BIP11. BP11SF is the general partner of each of BV11-A SF and BV11-B SF. BP Select I is the general partner of BV Select I. BP Select I GP is the general partner of BP Select I and BIP Select I. Agrawal, Brown, Feldman, Fleischer, Lee, Stoner, Thakker and Tobin (collectively the "BV Managing Members" ), as managing members of each of BP11 and BP11SF, share voting and investment authority over the shares held by each of BV11-A, BV11-B, BIP11, BV11-A SF, and BV11-B SF. The BV Managing Members and Elhafed, as managing members of BP Select I GP, share voting and investment authority over the shares held by each of BV Select I and BIP Select I. Row 11 of each Reporting Person's cover page to this Schedule 13G sets forth the percentages of the shares of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. The percentage set forth in each row 11 is based upon 98,795,586 shares of Class A common stock outstanding as of May 2, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on May 7, 2025. Row 5 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. Row 6 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. Row 7 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. Row 8 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. N Y Y Y Y Y Y Exhibit 99.1 Joint Filing Agreement Battery Ventures XI-A, L.P. /s/ Christopher Schiavo 05/15/2025 Battery Ventures XI-B, L.P. /s/ Christopher Schiavo 05/15/2025 Battery Ventures XI-A Side Fund, L.P. /s/ Christopher Schiavo 05/15/2025 Battery Ventures XI-B Side Fund, L.P. /s/ Christopher Schiavo 05/15/2025 Battery Investment Partners XI, LLC /s/ Christopher Schiavo 05/15/2025 Battery Partners XI, LLC /s/ Christopher Schiavo 05/15/2025 Battery Partners XI Side Fund, LLC /s/ Christopher Schiavo 05/15/2025 Battery Ventures Select Fund I, L.P. /s/ Christopher Schiavo 05/15/2025 Battery Partners Select Fund I, L.P. /s/ Christopher Schiavo 05/15/2025 Battery Investment Partners Select Fund I, L.P. /s/ Christopher Schiavo 05/15/2025 Battery Partners Select Fund I GP, LLC /s/ Christopher Schiavo 05/15/2025 Neeraj Agrawal /s/ Christopher Schiavo 05/15/2025 Michael M. Brown /s/ Christopher Schiavo 05/15/2025 Morad Elhafed /s/ Christopher Schiavo 05/15/2025 Jesse Feldman /s/ Christopher Schiavo 05/15/2025 Russell L. Fleischer /s/ Christopher Schiavo 05/15/2025 Roger H. Lee /s/ Christopher Schiavo 05/15/2025 Chelsea R. Stoner /s/ Christopher Schiavo 05/15/2025 Dharmesh Thakker /s/ Christopher Schiavo 05/15/2025 Scott R. Tobin /s/ Christopher Schiavo 05/15/2025